Mark 3:28

I tell you, men will be forgiven for everything, for all their sins and all the abusive things they say.

Matthew 12:31-32

Therefore, I tell you, men will be forgiven for any sin or abusive speech, but abusive speech about the Spirit cannot be forgiven.

Luke 12:10

And anyone who speaks against the Son of Man will be forgiven for it, but no one who reviles the holy Spirit will be forgiven.

1 John 5:16

If anyone sees his brother committing any sin except a deadly one, he will ask and obtain life for him??rovided the sin is not a deadly one. There is such a thing as deadly sin; I do not say that a man should pray about that.

Mark 3:28-30

I tell you, men will be forgiven for everything, for all their sins and all the abusive things they say.

Hebrews 6:4-8

For it is impossible to arouse people to a fresh repentance when they have once for all come into the light and had a taste of the gift from heaven, and shared in the holy Spirit

Hebrews 10:26-31

For if we choose to go on sinning after we have so fully learned the truth, there is no sacrifice left to be offered for our sins,

Treasury of Scripture Knowledge

Summary

Verily I say unto you, All sins shall be forgiven unto the sons of men, and blasphemies wherewith soever they shall blaspheme:

Bible References

General references

Matthew 12:31
Therefore, I tell you, men will be forgiven for any sin or abusive speech, but abusive speech about the Spirit cannot be forgiven.
Luke 12:10
And anyone who speaks against the Son of Man will be forgiven for it, but no one who reviles the holy Spirit will be forgiven.
Hebrews 6:4
For it is impossible to arouse people to a fresh repentance when they have once for all come into the light and had a taste of the gift from heaven, and shared in the holy Spirit
Hebrews 10:26
For if we choose to go on sinning after we have so fully learned the truth, there is no sacrifice left to be offered for our sins,
1 John 5:16
If anyone sees his brother committing any sin except a deadly one, he will ask and obtain life for him??rovided the sin is not a deadly one. There is such a thing as deadly sin; I do not say that a man should pray about that.